Simulations of planetary-scale collisions between rotating, differentiated bodies

In the late stages of terrestrial planet formation, pairwise collisions between planetary-sized bodies act as the fundamental agent of planet growth. These collisions can lead to either growth or disruption of the bodies involved and are largely responsible for shaping the final characteristics of planets. Despite their critical role in planet formation, an accurate treatment of collisions has yet to be realized. Therefore, we simulated a new set of 10,700 smoothed-particle hydrodynamics (SPH) simulations of pairwise collisions between rotating, differentiated bodies. This dataset is an order of magnitude larger than any previous collision dataset and is intended to serve as a training dataset for machine learning models, so that accurate surrogate models for planetary-scale collisions can be developed.在类地行星形成的晚期阶段，行星尺度天体之间的两两碰撞是驱动行星生长的核心过程。这类碰撞既可能使参与碰撞的天体实现生长，也可能导致其发生碎裂，并在很大程度上塑造了行星的最终特性。尽管这类碰撞在行星形成过程中发挥着至关重要的作用，但目前仍未能实现对其的精准建模与处理。为此，我们针对旋转分化天体之间的两两碰撞，开展了全新的10700组光滑粒子流体动力学（smoothed-particle hydrodynamics, SPH）模拟。本数据集的规模较此前所有同类碰撞数据集大一个数量级，旨在作为机器学习模型的训练数据集，以开发出可精准模拟行星尺度碰撞过程的替代模型。